Yes I have deleted history for it and freezed the transformation.
I did an experiment, I imported the fbx back into maya and noticed the materials are gone! Is there a bug in Maya’s fbx export tool?
so you created non-overlapping UV’s layout for light-maps? meaning for combined objects you created a separate UV set?
post-edit:
I exported the object using the 2017 fbx exporter version and got the following error white exporting:
LOG: [WARNING] Unable to export some material(s) - The plug-in does not support the following material types:
Material will be exported as a grey Lambert material.
It’s a Maya issue. I will post this question in a maya forum and point to the answer here.